Earlier quoted context omitted.
This is my fault for not explaining why I wasn't going to look into it more. According to the features it has listed, it offers me no obvious advantages to my current tools and claims to be difficult to setup and configure. Beyond that, if you truly want adoption for a tool, you'd invest time into making sure that you remove the obstacles of someone utilizing it. This is a tool that hasn't had any major releases sinc…
As silly as it sounds I think most of these tools are just being overly appreciated by a group who (at least sub-consciously) think of themselves as cool/badass for having some hacker-style terminal in front of them, you know it's true. Hit me all you want, but the same applies to Vim and Emacs for a large percentage of people who admire these tools. People religiously defend them just because they are 20 something y…
I'd used multiple email programs before finding my way to mutt, including various GUI programs. I'd used elm and pine briefly and somewhat enjoyed them. My primary mailer prior to mutt was Netscape's built-in mail client (NN3/4). The main problems with that were instability and some lack of flexibility.
Mutt took a week or so of getting used to ... and then ... just worked.
Not having an integrated editor (e.g.: making use of vim) was a huge win. One of the huge benefits of console-mode tools is that they can make use of one another in this way.
I've used a great many email clients since encountering mutt, and none are as fast, effective, reliable, and efficient as mutt. I keep coming back.
My complaints? Search through large volumes of mail (10s to 100s of thousands of messages) is slow. Google's use of tags is really useful, and more flexible than a highly-structured set of mailboxes. There are add-ons / forks of mutt which provide both features.
There's also a lot to be said for tools which work over a minimal configuration -- 24x80 vt100 emulation over serial line (your "last ditch" remote access method for most servers), SSH, Connectbot, console, etc.
Knock them all you want. The tools are useful, ubiquitous, standard, and effective.